Area Code Lookup
What Area Code Is Thousand Oaks?
2 area codes serve Thousand Oaks · California
Thousand Oaks is served by area codes 805, 820. It is located in California.
Area Codes Serving Thousand Oaks
Frequently Asked Questions
What area code is Thousand Oaks?
Thousand Oaks is served by area codes 805, 820. It is located in California.
Why does Thousand Oaks have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Thousand Oaks now has 2 area codes — 805 and 820 — covering the same or overlapping areas.
How do I call Thousand Oaks from outside the US?
To call Thousand Oaks from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-805-XXX-XXXX). The +1 is the country code for all NANPA countries.